<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>margin</title>

    <style>
        div {
            width: 100px;
            height: 100px;
            background-color: aqua;
            margin: 50px auto;
        }
    </style>

</head>

<body>
    <diV></diV>
    <diV></diV>


</body>

</html>